Recent content by mjbarcelona

  1. M

    Sizing MPCB

    Hi guys, just making sure that I'll be choosing the right size of MPCB, motor connected in star with current 3.32A, would a MPCB rated at 4A - 6.3A be good enough? Thanks!
  2. M

    3 phase furnace

    Hi megawatt, What I did was 36000/3 = 12000VA per phase, 12000/240 = 50 x 1.25 = 62.5A per phase. Where 240 is line to neutral 415/1.732=240. does that make sense? 1567733017 I see, interesting... 1567733131 Where'd you get that 1.75? 175% of rated current since i'm using a fuse?
  3. M

    3 phase furnace

    Hi guys, we have a 3 phase 415V 36kw furnace. Just wanted to know the fuse needed for each phase. we put a 40A fuse for each phase and 1 phase just blew when started firing it up. I tried to calculate the right fuse and I come up with 65A per phase? Is that right?
  4. M

    Pump Control

    Yup, you're right, sorry 'bout that, supply voltage's 400V, star indeed.. Thanks mate! Just wanted to confirm before doing it.
  5. M

    Secondary Transformer Circuit Breaker

    I'll use it to power PLC, 24V (10A) power supply, and contactors.
  6. M

    Pump Control

    Hi Rob, please see attached photos.
  7. Screenshot_20190905_175936.jpg

    Screenshot_20190905_175936.jpg

    • mjbarcelona
    • Media item
    • Comments: 0
    • Category: Professional Electrician
  8. Screenshot_20190905_175753.jpg

    Screenshot_20190905_175753.jpg

    • mjbarcelona
    • Media item
    • Comments: 0
    • Category: Professional Electrician
  9. M

    Pump Control

    Hi guys, I have a starter rated 440v, and wanted to use it to a pump rated at 220-240 delta/ 380-415 star, is it possible to connect it in delta? or it should only be star?
  10. M

    Secondary Transformer Circuit Breaker

    rated output voltage is 115V, when I measured it w/o load(open circuit) it's 125V.
  11. M

    Secondary Transformer Circuit Breaker

    I measured the output voltage of the secondary and it's 125V, calculating the current 1000/125 = 8Amps, by putting an MCB higher than 8amps, it would make the transformer hot right and burned eventually? To protect the transformer you would rather chose an MCB that's lower than 8amps? You're...
  12. M

    Secondary Transformer Circuit Breaker

    I'm planning to put 6amps on primary whilst on secondary i'll put 10amps? I was thinking that the proper breaker size for the secondary would be 1000/115 = 8.69 x 1.25 = 10.69amps?
  13. M

    Secondary Transformer Circuit Breaker

    Hi, I'm just curious about what will happen if I use an MCB lower than the calculated current rating. I have a 1kVA 220v stepdown to 110V transformer, calculated downstream MCB current rating would be 11.3625 if i'm right I multiplied the secondary current to 125%? what will happen if I use a...
  14. M

    Do I need over current protection?

    Hi guys, sorry I haven't really send all the details about this, I've attached a photo of the diagram that the manual says, It says to put thermal overload relay? plus fuse upstream the soft starter? I'll be using this for a pump, I've also attached the photo of the details of the pump. Thanks...
  15. IMG_20190902_113744.jpg

    IMG_20190902_113744.jpg

    • mjbarcelona
    • Media item
    • Comments: 0
    • Category: Professional Electrician

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